Active clinical trials for "Ischemia"

Endothelial damage has been reported after ischemia-reperfusion events. This can be characterized by measurements of glycocalyx and endothelial components that are released to blood after the insult. Sevoflurane and inhaled anesthetic commonly used for surgery have shown protective endothelial effects in animal and in-vitro models. Knee-ligament surgery with the use of a femoral tourniquet generates a transient ischemia-reperfusion (IR) state after the tourniquet is released. This research aims to compare the effect of sevoflurane and propofol in the release of glycocalyx and endothelial biomarkers after IR in this surgical scenario.

Treatment of ischemic myocardium has been the subject of intense research in recent years and stem cell therapy is one of the great promises. The InCor laboratory has studied cells from different backgrounds as candidates for cell therapy in the context of myocardial infarction. Evidence in preclinical studies of the application of stromal (mesenchymal) adipose tissue (hASC) in the ischemic heart by both the InCor group (in the animal model in rodents and pigs) and others in the literature suggest relevant benefits on the decrease of deterioration post-infarction. More recently it has been demonstrated that it arises mainly from the formation of new vessels due to paracrine factors, which are secreted by the injected cells. There are currently no studies in Brazil in which the safety of injecting different doses of hASC cells into the heart has been particularly evaluated. Recently, two studies have demonstrated the clinical applicability of hASC in patients with peripheral ischemic disease and stroke. Thus, the objective of this work will be to test the hypothesis that the implantation of autologous stromal cells derived from adipose tissue combined with myocardial revascularization surgery in patients with coronary artery disease

The Prediction of Anastomotic Insufficiency risk after Colorectal surgery (PANIC) study aims to establish a machine-learning-based application that allows for accurate preoperative prediction of patients at risk for anastomotic insufficiency after colon and colorectal surgery.

The investigators conduct this study to investigate whether oral administration of Dimethyl Fumarate, a Food and Drug Administration-approved drug for multiple sclerosis, is safe and effective in combination with intraarterial treatment in patients with Acute Ischemic Stroke.

Having a transient ischemic attack (TIA) or a minor stroke is a real risk factor not only for early recurrent stroke but also for major extracranial vascular events. Despite these warning events provide an opportunity for prevention usual post-discharge care of these subjects (mainly at primary care) is not associated with an optimal control of cerebrovascular risk factors (CRF). The investigators hypothesized that patients exposed to the intensified integrated multifactorial interventional care program (ICP) model would exhibit better management of CRF and receive more targeted advice than patients receiving standard care. A second objective was to investigate the effect of the ICP model on stroke recurrence or the appearance of major extracranial vascular events. To test this hypothesis the investigators perform a controlled, randomized, single blind, parallel trial. Subjects are recruited at the Stroke Unit and are randomized into two groups: 1. usual care (control group) and 2. ICP (intervention group). Patients assigned to receive usual care (general practitioner with the possibility of being referred to specialists) are compared to those assigned to undergo ICP. This ICP involves strict treatment goals (LDL-cholesterol <100 mg/dl, blood pressure <130/80 mmHg, HbA1c<7%, no smoking, regular exercise and no excessive alcohol consumption) to be achieved through behavior modification (diet, physical activity, smoking cessation, alcohol cessation) and a stepwise introduction of pharmacologic therapy for the main CRF (hypercholesterolemia, hypertension and diabetes). This multifactorial intervention is overseen in each primary care center by a trained general practitioner and nursery. The treatment goals are the same for the control group and the intervention group. General practitioners caring patients of each group are informed of these strict treatment goals. Patients in the ICP group receive a minimum of four scheduled individual consultations in one year (baseline, 3, 6 and 9 months). Primary and secondary outcomes are evaluated by an external Neurologist at 12 months after their inclusion.

Coronary artery disease (CAD) is the leading cause of death worldwide. Patients with severe CAD are often treated with coronary artery bypass grafting (CABG). Novel treatment strategies need to be pursued to respond to the continuous increase in the risk profile of contemporary CABG patients. Surgical myocardial revascularization is commonly performed with the use of cardiopulmonary bypass (CPB). Neurological impairment following CABG may take on the form of a new-onset motor deficit or postoperative cognitive dysfunction. The former is rare, but potentially devastating. Conversely, declines in attention, memory and fine motor skills can frequently be documented. Ischemic preconditioning is a phenomenon of an endogenous protective response to organ ischemia, which is triggered by brief cycles of nonlethal ischemia and reperfusion in tissues known to be more resistant to ischemic insults. In clinical practice remote ischemic preconditioning (RIPC) is achieved by inflicting short periods of ischemia with intermittent restitution of flow to the upper extremity. This intervention has been shown to be effective in the reduction of myocardial injury in cardiac surgical patients. The hypothesis tested in this research proposal is that RIPC will decrease the extent of postoperative neurological injury following CABG. In this research project, 70 patients scheduled for an elective CABG will be recruited at a single center. They will be randomly allocated to either undergo RIPC (intervention arm) or a sham procedure (control arm). Inflating a blood pressure cuff to 200 mmHg for 5 min will induce RIPC, thereby inducing a brief period of ischemia. This will be followed by a 5-minute arm reperfusion. In total, three cycles of arm ischemia and reperfusion will be induced in this fashion. All patients will undergo pre- and post-procedural magnetic resonance imaging (MRI) of the brain, as well as neurocognitive testing. The array of MRI tools that will be used for the quantification of brain injury will include fluid attenuated inversion recovery, diffusion weighted and susceptibility weighted imaging, coupled with resting state functional MRI. The investigators aim to determine whether RIPC can reduce the adverse impact of CPB on neurological outcome as evaluated by MRI detectable brain ischemia and neurocognition.

Patients with primary hyperaldosteronism experience more cardiovascular events compared to patients with primary hypertension, independent of the blood pressure level. In this research we hypothesize that patients with primary hyperaldosteronism are more susceptible to ischemia-reperfusion injury.

The primary objective of the study is to compare the effect of 90-day treatment with ticagrelor (180 mg [two 90 mg tablets] loading dose on Day 1 followed by 90 mg twice daily maintenance dose for the remainder of the study) vs acetylsalicylic acid (ASA)-aspirin (300 mg [three 100 mg tablets] loading dose on Day 1 followed by 100 mg once daily maintenance dose for the remainder of the study) for the prevention of major vascular events (composite of stroke, myocardial infarction [MI], and death) in patients with acute ischaemic stroke or transient ischaemic attack (TIA).

The purpose of the study is to make a head-to-head comparison of weight loss and interval training as methods of secondary prevention in overweight patients with ischemic heart disease.

The release of tourniquet produces reactive oxygen species which can cause injury. Propofol is chemically similar to phenol-based free radical scavengers. Plasma total antioxidant capacity is a well-established marker of the overall protective effect of antioxidants in body fluids.The aim of the study is to investigate the effects of propofol on ischemia-reperfusion injury in total knee arthroplasty (TKA).